666536 has 48 divisors (see below), whose sum is σ = 1482300. Its totient is φ = 279552.

The previous prime is 666529. The next prime is 666541. The reversal of 666536 is 635666.

It can be written as a sum of positive squares in 6 ways, for example, as 184900 + 481636 = 430^2 + 694^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 666536.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22970 + ... + 22998.

2⁶⁶⁶⁵³⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 666536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (741150).

666536 is an abundant number, since it is smaller than the sum of its proper divisors (815764).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666536 is a wasteful number, since it uses less digits than its factorization.

666536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78 (or 61 counting only the distinct ones).

The product of its digits is 19440, while the sum is 32.

The square root of 666536 is about 816.4165603416. The cubic root of 666536 is about 87.3523387083.

The spelling of 666536 in words is "six hundred sixty-six thousand, five hundred thirty-six".